Just and full compensation shall be paid upon the removal of any outdoor advertising signs, displays or devices, required by the provisions of section three of this article, which are (i) lawfully in existence at and upon the effective date hereof or (ii) lawfully in existence on or after the effective date hereof adjacent to any highway which shall be designated or redesignated as a part of the federal-aid interstate or primary systems or (iii) lawfully erected after the effective date hereof. Such compensation shall be paid for the following:
W. Va. Code § 17-22-5